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BOSEM Exam 2015: Science questions

Section-A
Chemistry
(Mark- 26)
1. Why is HF a polar molecule?                    1
2. How are kernels held together in a metal? 1
3. Write the balanced equation for the reaction between sodium hydroxide and sulphuric dioxide. 1
4. What chemical change is expected in the air when lightning occurs during thunderstrom? 1
5. What is an alloy? Give one important advantage of an alloy over its components? 2
6. Take about 10 ml of dil Na2CO3 solution in a beaker. Add two drops of methy orange indicator into      it. What is the colour of the mixture? Now add dil HCl solution drop by drop into the beaker till          the effervescence stops. Add a few more drops of dil HCl. What will be the colour of the solution        now? 2
7. What are the word root, primary suffix, secondary suffix and secondary prefix of 2-chloroethanol?      2
8. Draw a proportionate structure of graphic showing the bond together. 2
9. Describe the preparation of soap from fat. Write the relevant chemical equations. Why is soap not       suitable for washing in hard water? 3
10. Give one example each of (i) thermal decomposition, (ii) electrolytic decomposition and (iii)              photochemical decomposition. Give the equations. 3
11. Describe the methods of reduction used for (i) metals of low activity and (ii) metals of high               activity. 3
12. What is Mendeleev's Periodic Law? What are the merits and demerits of Mendeleev's Periodic           Table? Why is Modern Periodic Table considered to be an improvement over Mendeleev's Table?

To be contd..... 

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